Function reference
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          data_corpus_moviereviews
- Movie reviews from Pang and Lee (2004)
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          divergence()
- Optimize the number of topics for LDA
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          perplexity()
- Optimize the hyper-parameters for LDA
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          sizes()
- Compute the sizes of topics
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          terms()
- Extract most likely terms
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          textmodel_lda()
- Unsupervised Latent Dirichlet allocation
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          textmodel_seededlda()
- Semisupervised Latent Dirichlet allocation
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          textmodel_seqlda()
- Sequential Latent Dirichlet allocation
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          topics()
- Extract most likely topics